<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <style>
        li{
            color: red;
        }
        .blue{
            color: blue;
        }
    </style>
</head>
<body>
    <!-- 继承权重为 0 所以无法修改li的样式-->
    <ul class="blue">
        <li>
            我是li
        </li>
    </ul>
</body>
</html>